v0.63.0

New Features

• #788 Added virtualKeyboardState property to indicate if the virtual
  keyboard is currently visible or hidden. The property can also be modified to
  show or hide the virtual keyboard.
• In read-only mode, do not attempt to load the sounds and do not allow the
  virtual keyboard to be shown.
• Export version (previously available as MathLive.version).
• #199 Added infty and int inline shortcuts.

Bug Fixes

• #708 Pressing on the bottom part of the virtual keyboard keycap did not
  trigger the key action.
• The asset directory (fonts/sounds) was not properly located in some browsers
  when using a CDN to load Mathlive.
• Correctly focus the mathfield when the virtual keyboard is invoked.